<template>
  <a-upload
    v-model="fileList"
    name="avatar"
    list-type="picture-card"
    class="avatar-uploader"
    :show-upload-list="false"
    action="https://www.mocky.io/v2/5cc8019d300000980a055e76"
    :before-upload="beforeUpload"
    @change="handleChange"
  >
    <img v-if="imageUrl" :src="imageUrl" alt="avatar" />
    <div v-else>
      <div class="ant-upload-text">Upload</div>
    </div>
  </a-upload>
</template>
<script>
import { message } from 'ant-design-vue'
import { defineComponent, ref } from 'vue'

function getBase64(img, callback) {
  const reader = new FileReader()
  reader.addEventListener('load', () => callback(reader.result))
  reader.readAsDataURL(img)
}

export default defineComponent({
  components: {},

  setup() {
    const fileList = ref([])
    const loading = ref(false)
    const imageUrl = ref('')

    const handleChange = (info) => {
      if (info.file.status === 'uploading') {
        loading.value = true
        return
      }

      if (info.file.status === 'done') {
        // Get this url from response in real world.
        getBase64(info.file.originFileObj, (base64Url) => {
          imageUrl.value = base64Url
          loading.value = false
        })
      }

      if (info.file.status === 'error') {
        loading.value = false
        message.error('upload error')
      }
    }

    const beforeUpload = (file) => {
      const isJpgOrPng = file.type === 'image/jpeg' || file.type === 'image/png'

      if (!isJpgOrPng) {
        message.error('You can only upload JPG file!')
      }

      const isLt2M = file.size / 1024 / 1024 < 2

      if (!isLt2M) {
        message.error('Image must smaller than 2MB!')
      }

      return isJpgOrPng && isLt2M
    }

    return {
      fileList,
      loading,
      imageUrl,
      handleChange,
      beforeUpload
    }
  }
})
</script>
<style>
.avatar-uploader > .ant-upload {
  width: 128px;
  height: 128px;
}
.ant-upload-select-picture-card i {
  font-size: 32px;
  color: #999;
}

.ant-upload-select-picture-card .ant-upload-text {
  margin-top: 8px;
  color: #666;
}
</style>
